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Physics

Physics
The unit of noise pollution (level) is :

None of these
Ppm
Decibel
Decimal

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Physics
Which component of an IED creates an electrical charge?

Activator
Fuse
Explosive
Power source

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Physics
A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become

C
7C
C/7
14C

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Physics
During hot weather, the fan produces a feeling of comfort. This is because

Fan cools the air
Our perspiration eva-porates rapidly
Fan supplies cool air
Conductivity of air increases

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Physics
Transformer is a device to convert

Low voltage A.C. into high voltage A.C.
Low voltage D.C. into high voltage D.C.
C. to A.C.
Mechanical energy into Electrical energy

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Physics
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :

0.12638888888889
0.20902777777778
0.21111111111111
0.12777777777778

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